Submesoscale Eddies in the White Sea Based on Satellite Radar Measurements

Izvestiya, Atmospheric and Oceanic Physics - This paper presents the results of the analysis of the archive of radar images of Envisat Advanced Synthetic Aperture Radar (ASAR) and Radarsat-1,2 for...     

Critical diameters of detonation of explosives used in spacecraft separation systems

The article presents findings of systematic investigations of the detonation ability of advanced individual explosives, their mixtures, and materials used in spacecraft separation systems. A method for calculation and prediction of their critical detonation diameters is developed.     

Incipient metamorphism between Ufa and Beloretzk, western fold-and-thrust belt, southern Urals, Russia

The low-temperature thermal history of Paleozoic and Precambrian shales and slates was studied in detail along a NW–SE transect between Ufa and Beloretzk in the western fold-and-thrust belt of the southern Urals, Russia. The aim of the investigations was to compare four thermal parameters, namely illite and chlorite crystallinity, vitrinite reflectance, and Conodont color alteration index (CAI), in order to quantify the finite (i.e. maximum) thermal grade. The transect extends from Devonian to Permian sedimentary units of the pre-Uralian foredeep, crossing Precambrian siliciclastic and carbonate units of the Bashkirian megaanticlinorium into the Paleozoic units of the Ural-Tau antiform. In general, the four methods indicate similar metamorphic grades of the samples. The finite thermal grade ranges from lower diagenesis (R_o=0.9%, CIS-FWHM_ill001ad=0.770 Δ°2Θ, CIS-FWHM_chl002ad=0.447 Δ°2Θ, CAI=1.5) in the pre-Uralian foredeep to epizone (CIS-FWHM_ill001ad=0.243 Δ°2Θ, CIS-FWHM_chl002ad=0.252 Δ°2Θ, CAI=6) in the eastern part of the Bashkirian mega-anticlinorium and the Zilair synclinorium. All parameters show a sudden change in value at thrust boundaries and an increase in metamorphic grade with stratigraphic age within structural units. In comparison, the westernmost Precambrian units of the Ala-Tau-anticlinorium are characterized by thermal grades of lower diagenesis. Magmatic dikes cause a wide variation of the thermal grade in the western part of the Bashkirian megaanticlinorium. Also in areas with an intensive cleavage development (Zilair synclinorium) the finite thermal grade shows a stronger relationship towards the deformation than the stratigraphic position.     

Evolution of a Gas–Dust Cloud in the Upper Atmosphere: Analysis of Events October 26, 2017

Geomagnetism and Aeronomy - A sequence of digital images of a gas–dust cloud of combustion products of solid fuel that formed during the separation of rocket stages is analyzed. The images...     

Ore Genesis Laws in Subduction Zones

This paper considers and validates questions related to the multistage enrichment of the Earth’s crust in ore elements in subduction zones. We discuss some physical and chemical parameters of metamorphism and hydrothermal transformation of structural material complexes in these areas. The spatiotemporal patterns of ore genesis are demonstrated with the example of metallogeny of the Ural and Verkhoyansk–Kolyma fold belts.